CVE-2026-23888
Description
pnpm is a package manager. Prior to version 10.28.1, a path traversal vulnerability in pnpm's binary fetcher allows malicious packages to write files outside the intended extraction directory. The vulnerability has two attack vectors: (1) Malicious ZIP entries containing `../` or absolute paths that escape the extraction root via AdmZip's `extractAllTo`, and (2) The `BinaryResolution.prefix` field is concatenated into the extraction path without validation, allowing a crafted prefix like `../../evil` to redirect extracted files outside `targetDir`. The issue impacts all pnpm users who install packages with binary assets, users who configure custom Node.js binary locations and CI/CD pipelines that auto-install binary dependencies. It can lead to overwriting config files, scripts, or other sensitive files leading to RCE. Version 10.28.1 contains a patch.
How to fix
- pnpm pnpm10.28.1 or later
- pnpm10.28.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pnpm pnpm | v < 10.28.1 | 10.28.1 |
| pnpmnpm | v < 10.28.1 | 10.28.1 |
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